Unit lock installation jig



1967 F. J. RUSSELL ETAL fi UNIT LOCK INSTALLATION JIG Filed Oct. 4, 1965 2 Sheets-Sheet l INVENTORJ A950 Jwafim By 0659 J/Vm/M w WWW Feb 7, 1967 F. J. RUSSELL ETAL 3,302,674

UNIT LOCK INSTALLATION JIG 2 Sheets-Sheet 2 Filed OG'b. 4, 1965 IXVENTOKS F250 cf u5554 0555 A/o; m/

United States Iatent C) 3,392,674 UNIT LOCK INSTALLATIGN HG Fred J. Russell, 8635 Otis St., South Gate, Calif. 90280, and Roger .I. Noiin, Monterey Park, Caiif.; said Nolin assignor to said Russell Filed Oct. 4, 1955, Eel. No. 492,656 19 Claims. (Cl. 145l29) This application is a -continuation-inpart of copending application Serial No. 371,725 filed June 1, 1964 and now abandoned.

This invention relates generally to jigs and fixtures, and more particularly, to a jig for facilitating the installation of a latch or lock mechanism in a door.

This invention finds its most important use in connection with the rapid installation of preassembled, unit latch and lock mechanisms in doors.

In order to effect rapid and accurate installation of such devices in doors, it is necessary to provide accurately placed, specially shaped cutouts and recesses therein, into which the unit latch or lock mechanisms can be inserted and fastened. Heretofore, such cutouts or recesses were often made by laborious and time-consuming hand operations, with conventional tools, and with less than the most desirable resultant dimensional uniformity and accuracy. Various forms of jigs and fixtures have also been employed for such purposes, but heretofore these have been unduly complicate-d, usually having several separate pieces requiring as many different separate jig installations and cutting operations.

It is accordingly an object of this invention to provide a new and improved jig device for facilitating the cutting operations required for installations of latch and lock sets in doors.

It is another object of this invention to provide a jig device for guiding the special cutting operations required for the installations of unitary latch and lock sets in doors.

It is still another object of this invention to provide an improved jig device by means of which the special cutting operations required for installation of unitary latch and lock mechanisms in doors can be rapidly and accurately made, utilizing conventional sawing and drilling tools in connection therewith.

It is a further object of this invention to provide a special jig device for guiding cutting operations in door edges whereby preassembled unitary latch and lock sets can be inserted edgewise relative to the door and fixed in place in operative condition therein without necessitating disassembly of such sets.

Other objects and advantages and features of novelty of the invention will be evident hereinafter.

In the drawing in which a presently preferred embodiment of the invention is illustrated and in which like reference characters designate the same or similar parts:

FIGURE 11: is a perspective view of the jig assembly as it appears when clamped in an operative position upon the edge of a door;

FIGURE 1b is a perspective detailed view of a portion of the apparatus of FIGURE 1a;

FIGURE 2 is a fragmentary, side elevational view of the apparatus assembly as viewed from line 2-2 of FIGURE 3.

FIGURE 3 is a longitudinal sectional view taken on a horizontal plane running through the mid-section of FIG- URE 1a and as indicated by line 33 of FIGURE 2;

FIGURE 4 is a cross-sectional view taken on line 4-4 of FIGURE 3;

FIGURE 5 is a cross-sectional view taken on line 55 of FIGURE 3;

FIGURE 6 is a fragmentary, perspective view of the door portion of FIGURE 1a with the jig mechanism removed, showing the appearance of the cutout made in the edge of a door by use of the jig mechanism;

FIGURE 7 is a fragmentary side elevational view of the apparatus assembly similar to FIGURE 2, showing a modified form of a portion thereof;

FIGURE 8 is a fragmentary, side elevational view of the apparatus assembly similar to FIGURES 2 and 7, showing another modified form of a portion thereof;

FIGURE 9 is a cross-sectional view as it would appear taken on line 99 of either FIGURE 7 or 8;

FIGURE 10 is a fragmentary, side elevational view of the apparatus assembly similar to FIGURES 2, 7, and 8, showing a basic form of a portion thereof; and

FIGURE 11 is a cross-sectional view taken on line 1111 of FIGURE 10.

Referring now primarily to FIGURES 1a to 6, of the drawings, the jig assembly indicated generally at It) comprises a pair of parallel, oppositely spaced-apart, generally rectangular, identically constructed clamp members 12 and 14 which for convenience of description shall be termed as having forward ends 16 and 18 and opposite, rearward ends 20 and 22. The clamp members 12 and 14 are provided in the rearward portion thereof with a clamp screw mechanism shown generally at 28, by means of which the separation between the clamp members 12 and 14 may be manually adjusted while maintaining their parallelism or a given approximation thereof, such that they may be placed in forceful clamping engagement and released from such engagement with opposite faces of an edge portion of a door or the like body as illustrated in phantom lines at 343.

The portion of the clamp screw mechanism 28 by means of which the major spatial and clamping force adjustments are made to the clamp members 12 and 14-, comprises a crosswise extending clamp screw shaft 32, to one external end of which is fixed a knurled hand adjusting knob 34, and having formed on opposite portions of the clamp screw shaft 32 a pair of axially spaced-apart, externally threaded screw sections 36 and 33 which make threaded engagement within corresponding, internally threaded holes 40 and 42 in the clamp members 12 and 14 respectively. The threads of screw section 36 are right-handed, while the threads of screw section 38 are left-handed, whereby, as viewed in FIGURES la and 3, the clamp members 12 and 14 are moved in a closing direction toward one another by clockwise rotation of the clamp screw shaft 32, and whereby they are moved in an opening direction away from one another by counterclockwise rotation of the clamp screw shaft 32.

The clamp screw mechanism 23 also includes another crosswise extending auxilary shaft member 44 having formed thereon a pair of spaced-apart, externally threaded sections 46 and 48 which carry threaded thereon a pair of knurled, correspondingly internally threaded adjustment wheels 50 and 52. The aforesaid externally threaded sections 46 and 48 of the shaft member 4 extend axially slidably through smooth bored bushings 54 and 56 which are press-fitted into suitably sized holes in the clamp members 12 and 14 adjacent the rearward ends 20 and 22 thereof.

Extending longitudinally between and supported upon middle, unthreaded sections 58 and 6d of the clamp screw shaft 32 and shaft member 44- respectively, and centered intermediate the inner confronting faces 62 and 64 of clamp members 12 and 14, is a jig centering and positioning member 68. The jig centering and positioning member 68 is maintained in centered position upon the clamp screw mechanism shafts 32 and 44 by means of shallow, annular grooves 79 and 72 formed around the exterior, central portion of each of the unthreaded sec tions 58 and 60 respectively, with which pins 74 and 76, extending vertically through the centering and jig positioning member 68, make relatively rotatable, but axially fixed, engagement.

The inner, forwardly facing end of the jig centering and positioning member 68 is formed with a centrally located, vertically extending positioning ridge 78, the innermost vertical edge 80 of which serves as a stop member, which in use, serves as a means for determining the positioning of the jig assembly both horizontally and angularly with respect to the edge of a door to which it is applied, as will be hereinafter more fully described in connection with the operation of the apparatus.

Formed at locations vertically intermediate the upper and lower edges of the clamp members 12 and 14 and adjacent the forward ends 16 and 13 thereof are a pair of relatively large, coaxial, circular apertures 82 and 84 respectively. Detachably retained within the circular apertures 82 and 84 are a pair of identically formed, drill guide bushings 86. The drill guide bushings 86 are each formed, as best shown in FIGURES 1b and 3, with annular sleeve portions 911', each terminating at one end thereof in an integrally formed, generally rectangular flange, as shown at 94. The outside diameters of the annular sleeve portions 90 of the drill guide bushings 86 are such as to make relatively light sliding fits within the bores of the aforementioned circular apertures 82 and 84. At least two oppositely positioned corner portions of each of the rectangular flanges 94 are drilled, as shown at 98, to accommodate a pair of cap screws, as shown at 102, which are threaded into adjacent portions of the clamp members 12 and 14 and which serves to retain the drill guide bushings 86 firmly seated within the beforementioned circular apertures 82 and 84.

The inside diameters of the annular sleeve portions 90 of the drill guide bushings 86 may have any desired dimension corresponding closely to the diameter of a drill bit which is to be guided therethrough, as will be hereinafter more fully described in connection with the operation of the apparatus.

The forward end portions of each of the clamp members 12 and 14 are tapered in thickness as shown at 108 and 110 by forming the exterior surface thereof with an elongated, forwardly divergingly directed surface. Formed int-o each such sloping exterior surface is a shallow level recess, one of which is in view at 112 in FIGURE 1a, and having a fiat bottom surface parallel with the inner and outer exterior surfaces of the clamp members 12 and 14 whereby such recess is of longitudinally varying depth, being shallower at the forward end and deepest at its rearward end. The rearward, deepest portion of each of the shallow recesses 112 intersect the circular apertures 82 and 84 and are there formed with diagonally positioned, rectangular end portions, as shown at 114 in FIGURE 1a, to receive the aforementioned rectangular flanges 94 of the drill guide bushings 86.

Adjacent the forward ends of each of the clamp members 12 and 14 within the recessed portions, one of which is shown at 112 in FIGURE lb as beforementioned, are a pair of smaller diametered drill bushings as shown at 118 and 120. These drill bushings 118 and 120, which are each formed with end heads of slightly increased outside diameter as shown at 122, are press-fitted in suitable holes drilled through the thickness of the clamp members 12 and 14 and are formed with bores having inside diameters corresponding, with slight clearance, to that of drills which are to be guided therethrough, also as hereinafter more fully described.

Each of the clamp members 12 and 14 is provided in the rearward portion thereof with a pair of parallel, longitudinally extending, saw guide slots. Such saw guide slots may have several modified forms and be equipped with several different saw guide means such as principally illustrated in FIGURES 1a, 7, 8, and 10.

Referring to FIGURES 10 and 11 in which the most basic form of guide slot arrangement is illustrated, a pair of plain, relatively narrow guide slots are provided in clamp member 12 as shown at 124a and 126a, and in clamp member 14 as shown at 128a and 130a. The vertical spacing between slots 124a and 126a is the same as the vertical spacing between slots 128a and 139m and the pairs of slots in opposite clamp members 12 and 14 are positioned such that a plane passing through slots 124a and 128a is parallel to a plane passing through slots 126a and 139a, with both such parallel planes perpendicular to the respective inner confronting faces 62 and 64 of the clamp members 12 and 14. The said vertical spacing between slots is substantially equal to the inside diameter of the annular sleeve portions of the drill guide bushings 86. The widths of the guide slots 124a, 126a, 128a and 1311a are each the same and such as slidably to receive, with only slight clearance, a flat saw blade as illustrated in broken lines 123 in FIGURE 11. Such saw blade is preferably provided with teeth having little or no set.

The inner ends of each of the slots 124a, 126a, 128a, and 1313a terminate in an intersecting cylindrical end clearance aperture which extends through the thickness of the clamp members 12 and 14, three of which are in view as shown at 132, 134 and 136.

Referring again mainly to FIGURES 1a5 inclusive, a slightly improved form of the guide slot portion of the apparatus is shown. The counter parts of slots 124a, 126a, 128a and 139a of FIGURES l0 and 11, namely slots 124, 126, 128 and 130, are slightly wider, and the rearward ortion of the upper, inside edges of slots 124 and 128 are formed with still wider intervals having parallel, offset, downwardly facing seat surfaces 133 and 140, and the lower inside edge of slots 128 and are formed with similar, still Wider sections having parallel, offset upwardly facing surfaces 142 and 144, such surfaces serving as seats for rectangular guide plates 146, 148, 150 and 152 respectively.

The guide plates 146 and 148 are attached to the upper, downwardly facing seat surfaces 138 and respectively, and the guide plates 150 and 152 are attached to the lower, upwardly facing seat surfaces 142 and 144 respectively, each by means of a pair of recessed-head cap screws 154 which extend edgewise through countersunk holes in the adjacent edge portions of the clamp members 12 and 14 and into threaded engagement with correspondingly threaded holes in the respective guide plates. The surfaces of the guide plates, opposite those engaging the seat surfaces, stand slightly above the level of the inside edges of the adjacent parallel portions of the guide slots to afford saw tooth clearance and serve as saw guide surfaces as will be hereinafter more fully explained.

In the version of the apparatus shown in FIGURES 111-5 inclusive, a pair of bores 156 and 158 extend edgewise partially through the clamp member 12 from the upper edge thereof to a depth therein such as to intersect both of the slots 124 and 126. Another similar pair of bores 160 and 162 extend edgewise through the clamp member 14 from the lower edge thereof for a distance therein such as to intersect both of the slots 128 and 139. Contained axially slidable within each of the bores 156, 158, 160 and 162, intermediate the beforementioned intersected slots 124, 126, 128, and 130 is a guide plunger assembly consisting of a pair of coaxial, oppositely directed, cup shaped, guide plungers 164 and 166. Each of the guide plungers 164 and 166 is formed with a coaxial cylindrical recess closed at one end thereof with an externally rounded dome portion as shown at 168. The pairs of guide plungers 164 and 166 are positioned in the bores 156 and 158 with the open ends of such recesses con-fronting one another such as to retain in the space enclosed therein an elongated helical spring 170. The spring 170 acts under compression against the inner closed ends of the guide plungers 164 and 166, tending to move them axially apart in the bores 156, 158, 160

and 162, such axial movement being normally limited by contact of the dome end portion 168 thereof with the adjacent surfaces of the guide plates 146, 143, 151 and 152. The guide plunger assemblies 164 and 166 are thus retained within their bores by the guide plates 146, 143, 150 and 152 which, in the assembly of the apparatus, are placed in position in their respective slots 124, 126, 123 and 130 after the plunger assemblies 164 and 1136 are introduced through the outwardly opening ends of the bores 156, 158, 161) and 162.

. Referring next to FIGURES 8 and 9, in which an additionally modified form of the saw guides are illustrated, the saw guide slots 124, 126, 128 and 131), instead of being formed with plain, relatively narrow saw guide slots as shown in FIGURES l0 and ll, or with widened slots having recesessed seat sections in which guide plates 145, 148, 159 and 152 are fixed, as shown in FIGURES 1a, 2, 3, 4, and 5, comprise a plurality of pairs of parallel roller guides 184, 18-6, 188, and 1% are employed. Such pairs of roller guides 184, 186, 1813, and 1% are rotatably supported in partially enclosing pairs of semicylindrical recesses 192, 194, 196, and 193 formed in the clamp members 12 and 14, adjacent to and in parallel straddling positions relative to the slots 124, 126, 128, and 130 respectively, such as to guide a saw blade through such slots without contact with the edges thereof, as il lustrated at 123a in FIGURE 9. The roller guides 184, 186, 188, and 190 are rotatably supported on suitable rods or shafts which extend lengthwise through the semicylindrical recesses 192, 194, 196, and 1% as shown at 201).

In FIGURE 7 a further modification of the saw guide arrangement is illustrated, which is similar to that shown in FIGURES 8 and 9 except that instead of providing a single pair of elongated recesses and guide rollers adjacent each slot, the guide rollers and containing recesses are shortened to provide two pairs of recesses and independently rotatable guide rollers therein adjacent each slot as shown at 2-82, 204, 2136 and 2% in FIGURE 7. A central support, as shown at 21-9, is thereby provided for each of the shafts or rods 2% intermediate each recess and guide roller.

Referring further to FIGURES 7l1 inclusive, instead of, or in addition to the employment of a pair of drill bushings 118 and 129 located adjacent the forward end of each of the clamp members 12 and 14 as shown in, and hereinbefore described in connection with FIGURE la, a pair of drill bushings 118a and 1200. of the same or similar construction is located at an intermediate portion in the marginal portions of the upper and lower edges of each of the clamp members 12 and 14. Like the drill bushings 118 and 121 the drill bushings 118a and 120:: are each formed with end heads of slightly increased outside diameter as shown at 12214, with the shank portions thereof press-fitted into suitable holes drilled through the thicknesses of outwardly extending bosses 212 and 214 provided on the edges of the clamp members 12 and 14. Each of the drill bushings 118a and 120a are formed with bores having inside diameters corresponding, with slight clearance, to that of drills which are to be guided therethrough.

The operation of the apparatus is as follows. The jig assembly is applied to the edge of a door as shOWn in FIGURE la or 7, such door being indicated in phantom lines at 30, at a location thereon where it is desired to install a unit lock or latch. In such operative position the vertical edge 80 of the positioning ridge '73 carried by the jig centering and positioning member 68 is placed in uniform contact throughout its length with the surface of the edge of the door 30, thus determining both the horizontal position and angular attitude of the jig assembly 16 relative to the door edge. Next, the clamp screw shaft 32 is rotated by means of knurled knob 34 in a clockwise direction to draw the clamp members 12 and 14 toward one another into clamping engagement with the opposite faces of the door 38. Prior to the final tightening operation, the knurled adjustment wheels 51) and 52; are adjusted on the threaded sections 46 and 48 of the auxiliary shaft member 44 such that they make bearing engagement with the adjacent inside surfaces of the clamp members 12 and 14, whereby, upon completion of the tightening operation by means of the knurled knob 34, the clamping members 12 and 14 will be forced into parallelism with the faces of the door 311 with which they are thus placed in forceful clamping engagement.

Next, a drill or auger of a diameter approximately the inside diameter of the annular sleeve portions of the drill guide bushings 86 is inserted into one or the other of the said drill guide bushings 86 and a guided hole of such diameter thereby drilled through the thickness of the door panel, such hole being indicated at 172 in FIG- URE 6.

Next, a saw blade is inserted, as illustrated in broken lines 123, successively into the upper pair of guide slots 124a, 128:: an the lower pair of guide slots 126a, 136a if the version of the apparatus shown in FIGURES 10 and 11 is being employed, or as illustrated in broken lines 123, successively into the upper pair of guide slots 124, 123 and the lower pair of guide slots 126, 130', if the version of the apparatus shown in FIGURES 1a-5 is being employed, or as shown in broken lines 123 successively between the upper pairs of roller guides 184, 188 and the lower pairs of roller guides 186, 1913, if the version of the apparatus shown in FIGURES 8 and 9 are being employed, or similarly between the plurality of pairs of guide rollers shown in FIGURE 7, and a pair of saw cuts made into the edge of the door to depths limited by the lengths of the slots which terminate at their innerforward ends in the hereinbefore described clearance apertures, three of which are in view at 132, 134, and 136 in FIGURES la and 2 and two of which are in view at 134 and 136 in FIGURES 7, 8, and 10. The location of such resultant saw slots is indicated at 174 and 176 in FIGURE 6.

An important feature of this invention is the slidable guidance furnished for the saw in the saw guide slots. In the version of the apparatus shown in FIGURES 1a- 5, accurate guidance of the saw is provided by the action of the guide plungers 164 and 166. In opeartion, the side surface of the saw is forced against the under surfaces of the upper guide plates 146 and 148, and the upper surfaces of the lower guide plates 150 and 152 as the case may be, by means of contact therewith of the dome portion 168 of the guide plungers 164 and 166, acti .g under the force of the helcal compression springs 171' The saw thus slidably guided is so positioned that its teeth clear the edges of the inner adjacent portions of the slots. In the modified version of the dev ce illustrated in FIGURES 7l1 inclusive, accurate guidance of the saw is provided by the action of the pairs of guide rollers there employed with the advantage of more friction-free operation.

In some types of unit locks or latches, one or more inwardly extending bosses are provided, extending inwardly from the inner surfaces of the lock rosettes, for locating and retaining engagement with suitable holes or recesses in the door panel. To provide for such holes or recesses for such bosses, the hereinbefore described drill bushings as shown at 118 and 120 in FIGURE 1a or as shown at 118:: and 12% in FIGURES 7, 8, and 10 are provided. By passing suitably sized drills through these bushings, drill holes may thus be formed into or through the door panel as illustrated at 178 and 186 or 178a and 189a in FIGURE 6, and into which the beforementioned rosette bosses may extend, to retain the unit lock or latch in proper place in the door.

Next, the jig assembly 10 is removed from the edge of the door 36 by loosening of the clamping mechanism. After such removal the two saw. cuts 174 and 176, previously formed in the edge of the door to the limit of the depth permitted by the length of the guide slots,

as hereinbefore described, are completed by reinsertion of the saw into the thus partially completed cuts 174 and 176, and the sawing operation continued, guided by the previously formed portions of the saw cuts 174 and 176, until they tangentially intersect diametrically upper and lower edges of the hole 172 previously drilled through the drill guide bushings 86. In some cases where the wood grain permits it, the remaining uncut portion between the partially completed saw cuts 174 and 176 and the drilled hole 172 can be knocked out by a hammer. Upon completion of the foregoing operations, the resultant cutout in the edge of the door will have the appearance illustrated generally at 182 in FIGURE 6, ready for slida-ble insertion thereinto of a unit lock or latch assembly.

Various materials may be used for the construction of the hereinbefore described jig assembly 10, but in the interest of saving weight, the major portion thereof, for example, the clamping members 12 and 14, and guide rollers of the pairs of roller guides 134-199 and 2924.03, are preferably made of an aluminum alloy. The guide plates 146, 148, 150 and 152, the major drill guide bush mgs 86 and the smaller drill bushings 118 and 120 and 118a and 120a, are preferably made of steel, as are also the clamp screw shaft 32 and the auxiliary shaft member 44.

It is to be understood that the foregoing is illustrative only, and that the invention is not to be limited thereby, but may include various modifications and changes made by those skilled in the art without distinguishing from the scope of the invention, as defined in the appended claims.

What is claimed is:

1. In a unit lock installation jig, apparatus comprising:

a body member adapted to be positioned in engagement with a door face adjacent an edge thereof;

a pair of saw guides in said body member, each positioned for guiding a saw such as to make a pair of spaced-apart saw cuts inwardly from such door edge;

and a drill guide in said body member positioned for guiding the boring of a cross-hole through such door from face-to-face thereof,

said pair of saw guides and said drill guide being positioned relative to one another in said body member such that one of the thus guided saw cuts is directed toward joining one circumferential portion of such cross-hole and the other of the thus guided saw cuts is directed toward joining another circumferential portion of such cross-hole.

2. Apparatus in accordance with claim 1 and at least one additional drill guide in said body member adjacent said first-mentioned drill guide, positioned for guiding a drill to drill a hole in the face of such door, to serve as a retaining means for receiving an inward projection from aunit lock.

3. In a unit lock installation jig, apparatus comprising:

a body member adapted to be positioned in engagement with a door face adjacent an edge thereof;

guide means carried by said body member for determining the position of said body member in predetermined relation to the said edge of such door;

a pair of saw guides in said body member, each positioned for guiding a saw such as to make a pair of spaced-apart saw cuts inwardly from such door edge when positioned as aforesaid;

and a drill guide in said body member positioned for guiding the boring of a cross-hole through such door from face-to-face thereof,

said pair of saw guides and said drill guide being positioned relative to one another in said body member such that one of the thus guided saw cuts is directed toward joining one circumferential portion of such cross-hole and the other of the thus guided saw cuts is directed toward joining another circumferential portion of such cross-hole.

4. In a unit lock installation jig, apparatus com rising:

a pair of oppositely spaced-apart body members adapted 8 to be positioned in clamping engagement with opposite faces of a door adjacent an edge thereof;

a pair of laterally spaced-apart saw guides in each of said body members, the corresponding saw guides of one such pair being positioned opposite the corresponding saw guides of the other such pair, whereby a saw may be guided through corresponding saw guides of said pairs to make a pair of spaced-apart saw cuts inwardly from the door edge;

and a drill guide in each of said body members, coaxially positioned relative to one another, for guiding the boring of a cross-hole through the thickness of such door,

said saw guides and said drill guides being positioned relative to each other in said body members such that one of the thus guided saw cuts is directed toward substantially tangentially joining one circumferential portion of such cross-hole and the other of the thus guided saw cuts is directed toward substantially tangentially joining an opposite circumferential portion of such cross-hole.

5. Apparatus in accordance with claim 4 and:

at least one additional drill guide in at least one of said body members for guiding a drill to make a hole in at least one face of such door, to serve as means for receiving an inward projection from a unit lock, for retaining said lock in position in said door.

6. Apparatus in accordance with claim 4 and:

at least one additional drill guide in each of said body members positioned adjacent the corresponding firstmentioned drill guide therein for guiding a drill to make a hole in each face of such door, to serve as means for receiving inward projections from opposite portions of a unit lock, for retaining said lock in position in said door.

7. In a unit lock installation jig, apparatus comprising:

a body member having a thickness substantially less than the length and width thereof adapted to be posi tioned with a side face thereof in engagement with a door face adjacent an edge thereof;

a saw guide in said body member, said saw guide including;

an elongated slot extending through the thickness of said body member and inwardly from one edge thereof and;

a guide plate in the outer portion of said slot, one side of said plate being fixed to one inner side of said slot whereby a guide clearance is formed between the other side of said guide plate and the other side of said slot;

a bore formed edgewise in said body member and intersecting said slot opposite said other side of said guide plate;

a guide plunger axially slidably contained in said bore, with one end thereof normally extending into said slot;

and resilient means in said bore acting upon said plunger to urge said plunger axially in said bore toward said slot.

8. In a unit lock installation jig, apparatus comprising:

a body member adapted to be positioned with a side race thereof in engagement with a door face adjacent an edge thereof;

a drill guide in said body member positioned for guiding the boring of a cross-hole through such door from face-to-face thereof;

and a saw guide in said body member, said saw guide including:

an elongated slot extending through the thickness of said body member and inwardly from one edge thereof and;

a guide roller supported by said body for rotation about its longitudinal axis, said axis being parallel with said slot and with at least a part of the periphery of said guide roller extending from one side of said 9 slot into said slot, whereby a saw guide space is formed between said guide roller and the adjacent other side of said slot for guidingly receiving a saw blade for directing a saw cut thereby toward joining one circumferential portion of such cross-hole.

9. In a unit lock installation jig, apparatus comprising:

a body member adapted to be positioned with a side face thereof in engagement with a door face adjacent an edge thereof;

a drill guide in said body member positioned for guiding the boring of a cross-hole through such door from face-to-face thereof;

a saw guide in said body member, said saw guide in eluding:

an elongated slot extending through the thickness of said body member and inwardly from one edge thereof and;

a pair of guide rollers rotatably supported by said body, said rollers being rotatable about their longitudinal axes and said axes being positioned parallel with and on opposite sides of said slot with a portion of the periphery of each of said rollers extending into said slot, whereby a guide clearance is formed bet-ween said guide rollers positioned to direct a saw blade therein to make a saw cut toward joining a circumferential portion of said cross-hole.

10. In a unit lock installation jig, apparatus comprising:

a body member having a thickness substantially less than the length and width thereof adapted to be positioned with a side face thereof in engagement with a door face adjacent an edge thereof;

a drill guide in said body member positioned to guide the boring of a cross-hole through such door from face-to-face thereof;

a saw guide in said body member, said saw guide including:

at least a pair of guide rollers rotatably supported by said body member in parallel, adjacently spacedapart relation to one another, whereby a guide clearance space is formed between the adjacent parallel surfaces of said guide rollers directed toward substan tially tangential intersection with a circumferential portion of such cross-hole.

11. In a unit lock installation jig, apparatus comprising:

a pair of oppositely spaced-apart body members adapted to be clampingly positioned with opposite faces thereof in engagement with opposite faces of a door adjacent an edge thereof;

a drill guide in each of said body members, coaxially positioned relative to one another, for guiding the boring of a cross-hole through the thickness of such door;

a pair of laterally spaced-apart guides in each of said body members, the corresponding saw guides of one such pair being positioned opposite the corresponding saw guides of the other such pair, whereby a saw may be guided through corresponding saw guides of said pairs to make a pair of spaced-apart saw cuts inwardly from the door edge, said saw guides each including:

an elongated slot extending through the thickness of its body member and inwardly from one edge thereof and;

at least a pair of guide rollers rotatably supported by the body member in parallel, adjacently spaced-apart relation to one another, said rollers of such pair being positioned on opposite sides of said slot such that a guide clearance space is formed between the adjacent parallel surfaces of said guide rollers directed toward intersection with a circumferential portion of such cross-hole.

12. Apparatus in accordance with claim 11 and:

at least one additional drill guide in at least one of said body members for guiding a drill to make a hole in at least one face of such door, to serve as means for receiving an inward projection from a unit lock, for retaining said lock in position in said door.

13. In a unit lock installation jig, apparatus comprising:

a body member adapted to be positioned in engagement with a door face adjacent an edge thereof;

a saw guide in said body member, said saw guide including:

an elongated slot extending inwardly into said body member from one edge thereof, said slot having an outer portion of decreased effective width relative to an inner portion thereof,

at least one pressure means extending from said body member through one side of the said outer portion of said slot for slidable engagement with a surface of a saw blade positioned therein for urging the 0pposite surface of said saw blade into guided slidable engagement with the adjacent opposite side of said outer portion of said slot and;

resilient means in said body member for urging said pressure means into said slidable engagement with said surface of such saw blade.

14. Apparatus in accordance with claim 13 wherein said body member has reference surfaces adapted to be positioned in engagement with a door edge and an adjacent portion of the face thereof;

and means for detachably clamping said body member in such position of engagement with such door.

15. Apparatus in accordance with claim 3 and means for detachably clamping said body member in such position of engagement with such door.

16. Apparatus in accordance with claim 13; and

reference guide means carried by said body member for determining the position of said body in predetermined relation to the said edge of such door.

17. Apparatus in accordance with claim 1 in which each of said saw guides comprises an elongated slot extending inwardly into said body member from one edge thereof.

18. Apparatus in accordance with claim 17 in which each of said slots is formed with an inner portion of increased effective width relative to an outer portion thereof.

19. In a lock installation jig, apparatus comprising:

a body member adapted to be positioned in engagement with a door face adjacent an edge thereof;

means for detachably clamping said body member in such position of engagement;

a saw guide in said body member, said saw guide including:

an elongated slot extending through the thickness of said body member and inwardly from one edge thereof; and

a guide plate in the outer portion of said slot, one side of said plate being fixed to one inner side of said slot whereby a guide clearance is formed between the other side of said guide plate and the other side of said slot;

a bore formed edgewise in said body member and intersecting said slot opposite the other side of said guide plate;

a guide plunger axially slidably contained in said bore, with one end thereof normally extending into said slot;

and resilient means in said bore acting upon said plunger to urge said plunger axially in said bore toward said slot.

References Cited by the Examiner UNITED STATES PATENTS 1,704,581 3/1929 Smith 143160 1,736,709 11/1929 Flagg 14386 X WILLIAM FELDMAN, Primary Examiner.

R. V. PARKER, Assistant Examiner. 

1. IN A UNIT LOCK INSTALLATION JIG, APPARATUS COMPRISING: A BODY MEMBER ADAPTED TO BE POSITIONED IN ENGAGEMENT WITH A DOOR FACE ADJACENT AN EDGE THEREOF; A PAIR OF SAW GUIDES IN SAID BODY MEMBER, EACH POSITIONED FOR GUIDING A SAWSUCH AS ATO MAKE A PAIR OF SPACED-APART SAW CUTS INWARDLY FROM SUCH DOOR EDGE; AND A DRILL GUIDE IN SAID BODY MEMBER POSITIONED FOR GUIDING THE BORING OF A CROSS-HOLE THROUGH SUCH DOOR FROM FACE-TO-FACE THEREOF, SAID PAIR OF SAW GUIDES AND SAID DRILL GUIDE BEING POSITIONED RELATIVE TO ONE ANOTHER IN SAID BODY MEMBER SUCH THAT ONE OF THE THUS GUIDED SAW CUTS IS DIRECTED TOWARD JOINING ONE CIRCUMFERENTIAL PORTION OF SUCH CROSS-HOLE AND THE OTHER OF THE THUS GUIDED SAW CUTS IS DIRECTED TOWARD JOINING ANOTHER CIRCUMFERENTIAL PORTION OF SUCH CROSS-HOLE. 